<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <meta name="color-scheme" content="dark light" />

    <style>
      body {
        user-select: none;
        cursor: default;
        margin: 0;
        padding: 0;
        width: 100vw;
        height: 100vh;
        overflow: hidden;
      }

      * {
        box-sizing: border-box;
      }

      .app {
        margin: 16px;
        margin-top: 3px;
        box-shadow: 0 12px 16px rgba(0, 0, 0, 0.12),
          0 8px 10px rgba(0, 0, 0, 0.16);
        overflow: hidden;
        position: relative;
        transition: 0.3s opacity;
        background-color: white;
        width: fit-content;
        opacity: 0;
      }

      .visible {
        opacity: 1;
      }
    </style>
  </head>

  <body>
    <div id="app" class="app">
      <div id="container"></div>
    </div>
  </body>
</html>
